21894104135 has 4 divisors (see below), whose sum is σ = 26272924968. Its totient is φ = 17515283304.

The previous prime is 21894104119. The next prime is 21894104137. The reversal of 21894104135 is 53140149812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21894104135 - 2⁴ = 21894104119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894104137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2189410409 + ... + 2189410418.

It is an arithmetic number, because the mean of its divisors is an integer number (6568231242).

Almost surely, 2^21894104135 is an apocalyptic number.

21894104135 is a deficient number, since it is larger than the sum of its proper divisors (4378820833).

21894104135 is an equidigital number, since it uses as much as digits as its factorization.

21894104135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378820832.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 21894104135 in words is "twenty-one billion, eight hundred ninety-four million, one hundred four thousand, one hundred thirty-five".